Rod Based Frame and Linear Rail Cube?

I'm thinking of designing a a large cube type printer that uses rods for the frame as well as linear motion. It would be 12 rods total, each 2' (600 mm) in length. I'm thinking of using 1/2" (12.7 mm) rod. Is this feasible or will there be two much flex at the corners where I have 3 rods connecting?

Edited 1 time(s). Last edit at 12/02/2014 01:07PM by runninfarmer.

As long as you don't plan on using printed parts for those unions, you might get a "decent" frame. I personally would not recommend rods for the frame itself (too much flexing) I will rather go with thick aluminum angles. or welded metal plates (usually metal shops consider our printers plates sizes "waste" so they can make few bucks out of building you a rock solid box) then is just drawing the templates and few drillings here and there.

Good luck.